const EventEmitter  = require("events");

const Game          = require("./Game");

class EventScheduler extends EventEmitter {
    constructor(typeID, id, mapID) {
        super();

        this.entity = { 
            typeID, 
            id
        };

        this.events = {};
        this.mapID = mapID;
    };

    setLocalization(mapID) {
        this.mapID = mapID;
    } 

    getLocalization = () => this.mapID;

    setReusableSingleEvent(id, time, data) {
        if (!this.events[id] || this.events[id][0].isOver) {
            const previousTick = this.getEventTick(id);
            const relativeTo = previousTick ? previousTick : performance.now();
            const tickAt = relativeTo + (time > 0 ? time : 0);
            
            const event = { 
                id, 
                entity: this.entity,
                isCancelled: false,
                index: 0,
                tickAt,
                data,
                getLocalization: this.getLocalization,
                isSingle: true,
                isOver: false
            };

            Game.events.add(tickAt, event);
            this.events[id] = [event];
        } else {
            this.events[id][0].isCancelled = false;
        };
    }

    setSingleEvent(id, time, data) {
        const tickAt = performance.now() + time;

        const event = { 
            id, 
            entity: this.entity,
            isCancelled: false,
            index: 0,
            tickAt,
            data,
            getLocalization: this.getLocalization
        };

        if (!this.events[id]) {
            Game.events.add(tickAt, event);
            this.events[id] = [event];
        };
    }

    setEventTest2(id, time, data) {
        const previousTick = this.getEventTick(id);
        const relativeTo = previousTick ? previousTick : performance.now();
        const tickAt = relativeTo + time;

        const event = { 
            id, 
            entity: this.entity,
            isCancelled: false,
            index: this.events[id] ? this.events[id].length - 1 : 0,
            tickAt,
            data,
            getLocalization: this.getLocalization
        };

        Game.events.add(tickAt, event);
        this.events[id] = [event];
	}

    setEvent(id, time, data) {
        const previousTick = this.getEventTick(id);
        const relativeTo = previousTick ? previousTick : performance.now();
        const tickAt = relativeTo + time;

        const event = { 
            id, 
            entity: this.entity,
            isCancelled: false,
            index: this.events[id] ? this.events[id].length - 1 : 0,
            tickAt,
            data,
            getLocalization: this.getLocalization
        };

        Game.events.add(tickAt, event);

        if (this.events[id]) this.events[id].push(event);
        else this.events[id] = [event];
	}

    setIndependentEvent(id, time, data) {
        const tickAt = performance.now() + time;

        const event = { 
            id, 
            entity: this.entity,
            isCancelled: false,
            index: this.events[id] ? this.events[id].length : 0,
            tickAt,
            data,
            getLocalization: this.getLocalization
        };

        Game.events.add(tickAt, event);

        if (this.events[id]) this.events[id].push(event);
        else this.events[id] = [event];
    }

	getEventTick(id, index) {
		const event = this.events[id];
		if (!event) return 0;

        if (!index) index = event.length - 1;

		const element = event[index];
		return element && !element.isOver && element.tickAt;
	}

    removeEvent(id) {
        delete this.events[id];
    }

	cancelEvent(id, index) {
        if (this.events[id]) {
            if (index == null) {
                for (let i = 0; i < this.events[id].length; i++) this.events[id][i].isCancelled = true;
            } else if (index === -1) {
                for (let i = 0; i < this.events[id].length - 1; i++) this.events[id][i].isCancelled = true;
            } else {
                this.events[id][index].isCancelled = true;
            };
        };
    }
};

module.exports = EventScheduler;